recipes: Enable nativesdk for gperf, unifdef, gi-docgen and its dependencies

I'm building a SDK (bitbake task: populate_sdk) for WPE/WebKit
development [1] and I need the tools below to be extended with the class
nativesdk. They work fine on the SDK after this change.

The needs are because:

1) gperf and unifdef are required by the WebKit build system at build
   time.

2) gi-docgen is required by the WebKit build system when CMake option
   'ENABLE_DOCUMENTATION' is enabled, and gi-docgen itself depends on
   the following python modules that also need to enable nativesdk:
   python3-markdown, python3-smartypants and python3-typogrify

[1]
See:
 - https://github.com/Igalia/meta-webkit/pull/436
 - https://bugs.webkit.org/show_bug.cgi?id=249604

(From OE-Core rev: 6cb38fd632a161bea7b9a04de400d8be8d565b07)

Signed-off-by: Carlos Alberto Lopez Perez <clopez@igalia.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/ruby/ruby_3.1.3.bb

@@ -15,6 +15,7 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=5b8c87559868796979806100db3f3805 \
 
 DEPENDS = "zlib openssl libyaml gdbm readline libffi"
 DEPENDS:append:class-target = " ruby-native"
+DEPENDS:append:class-nativesdk = " ruby-native"
 
 SHRT_VER = "${@oe.utils.trim_version("${PV}", 2)}"
 SRC_URI = "http://cache.ruby-lang.org/pub/ruby/${SHRT_VER}/ruby-${PV}.tar.gz \
@@ -139,4 +140,4 @@ FILES:${PN}-ptest:append:class-target = "\
     ${libdir}/ruby/${SHRT_VER}.0/*/-test- \
 "
 
-BBCLASSEXTEND = "native"
+BBCLASSEXTEND = "native nativesdk"